/*
 * Copyright @ 2018 - present 8x8, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jitsi.jibri.util

import org.jitsi.jibri.status.ComponentState

abstract class NotifyingStateMachine {
    private val stateTranstionHandlers = mutableListOf<(ComponentState, ComponentState) -> Unit>()

    protected fun notify(fromState: ComponentState, toState: ComponentState) {
        stateTranstionHandlers.forEach { handler ->
            handler(fromState, toState)
        }
    }

    fun onStateTransition(handler: (ComponentState, ComponentState) -> Unit) {
        stateTranstionHandlers.add(handler)
    }
}
